Try this fairly robust code:
numberOfTries = 0;
while numberOfTries < 20 % Failsafe
% Get the name of the file that the user wants to use.
startingFolder = pwd; % Whatever you want.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
% User clicked the Cancel button.
break;
end
fullFileName = fullfile(folder, baseFileName)
[folder, baseFileName, extension] = fileparts(fullFileName)
if strcmpi(extension, '.wav')
break; % out of while loop
else
message = sprintf('Error: you must pick a wav file, not a "%s" file.', extension);
uiwait(warndlg(message));
end
end
